From: Icenowy Zheng <[email protected]>
The ANX6345 is an ultra-low power DisplayPower/eDP transmitter designed
for portable devices. This driver adds initial support for RGB to eDP
mode, without HPD and interrupts.
This is a configuration usually seen in eDP applications.
Signed-off-by: Icenowy Zheng <[email protected]>
Signed-off-by: Vasily Khoruzhick <[email protected]>
Signed-off-by: Torsten Duwe <[email protected]>
---
drivers/gpu/drm/bridge/analogix/Kconfig | 11 +
drivers/gpu/drm/bridge/analogix/Makefile | 1 +
drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 808 +++++++++++++++++++++
.../gpu/drm/bridge/analogix/analogix-i2c-dptx.c | 2 +-
.../gpu/drm/bridge/analogix/analogix-i2c-dptx.h | 8 +
.../drm/bridge/analogix/analogix-i2c-txcommon.h | 3 +
6 files changed, 832 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
index ed2d05c12546..3c6ec535d361 100644
--- a/drivers/gpu/drm/bridge/analogix/Kconfig
+++ b/drivers/gpu/drm/bridge/analogix/Kconfig
@@ -1,3 +1,14 @@
# SPDX-License-Identifier: GPL-2.0-only
+config DRM_ANALOGIX_ANX6345
+ tristate "Analogix ANX6345 bridge"
+ select DRM_ANALOGIX_DP_I2C
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ help
+ ANX6345 is an ultra-low Full-HD DisplayPort/eDP
+ transmitter designed for portable devices. The
+ ANX6345 transforms the LVTTL RGB output of an
+ application processor to eDP or DisplayPort.
+
config DRM_ANALOGIX_ANX78XX
tristate "Analogix ANX78XX bridge"
select DRM_ANALOGIX_DP_I2C
diff --git a/drivers/gpu/drm/bridge/analogix/Makefile b/drivers/gpu/drm/bridge/analogix/Makefile
index 2d523b67487d..12fed7b04e1e 100644
--- a/drivers/gpu/drm/bridge/analogix/Makefile
+++ b/drivers/gpu/drm/bridge/analogix/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o
analogix_dp_i2c-objs := analogix-i2c-dptx.o
+obj-$(CONFIG_DRM_ANALOGIX_ANX6345) += analogix-anx6345.o
obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o
obj-$(CONFIG_DRM_ANALOGIX_DP_I2C) += analogix_dp_i2c.o
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
new file mode 100644
index 000000000000..36f38a9f042a
--- /dev/null
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) Icenowy Zheng <[email protected]>
+ * Based on analogix-anx6345.c, which is:
+ * Copyright(c) 2016, Analogix Semiconductor.
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+#include <drm/drm_panel.h>
+
+#include "analogix-i2c-dptx.h"
+#include "analogix-i2c-txcommon.h"
+
+#define I2C_NUM_ADDRESSES 2
+#define I2C_IDX_DPTX 0
+#define I2C_IDX_TXCOM 1
+
+#define POLL_DELAY 50000 /* us */
+#define POLL_TIMEOUT 5000000 /* us */
+
+static const u8 anx6345_i2c_addresses[] = {
+ [I2C_IDX_DPTX] = ANALOGIX_I2C_DPTX,
+ [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON,
+};
+
+struct anx6345 {
+ struct drm_dp_aux aux;
+ struct drm_bridge bridge;
+ struct i2c_client *client;
+ struct edid *edid;
+ struct drm_connector connector;
+ struct drm_dp_link link;
+ struct drm_panel *panel;
+ struct regulator *dvdd12;
+ struct regulator *dvdd25;
+ struct gpio_desc *gpiod_reset;
+ struct mutex lock;
+
+ /*
+ * I2C Slave addresses of ANX6345 are mapped as DPTX and SYS
+ */
+ struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
+ struct regmap *map[I2C_NUM_ADDRESSES];
+
+ u16 chipid;
+ u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+ bool powered;
+};
+
+static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
+{
+ return container_of(c, struct anx6345, connector);
+}
+
+static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct anx6345, bridge);
+}
+
+static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
+{
+ return regmap_update_bits(map, reg, mask, mask);
+}
+
+static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
+{
+ return regmap_update_bits(map, reg, mask, 0);
+}
+
+static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
+ struct drm_dp_aux_msg *msg)
+{
+ struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
+
+ return anx_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
+}
+
+static int anx6345_dp_link_training(struct anx6345 *anx6345)
+{
+ unsigned int value;
+ u8 dp_bw;
+ int err;
+
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+ SP_POWERDOWN_CTRL_REG,
+ SP_TOTAL_PD);
+ if (err)
+ return err;
+
+ err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
+ if (err < 0)
+ return err;
+
+ switch (dp_bw) {
+ case DP_LINK_BW_1_62:
+ case DP_LINK_BW_2_7:
+ break;
+
+ default:
+ DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
+ return -EINVAL;
+ }
+
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+ SP_VIDEO_MUTE);
+ if (err)
+ return err;
+
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+ SP_VID_CTRL1_REG, SP_VIDEO_EN);
+ if (err)
+ return err;
+
+ /* Get DPCD info */
+ err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
+ &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
+ if (err < 0) {
+ DRM_ERROR("Failed to read DPCD: %d\n", err);
+ return err;
+ }
+
+ /* Clear channel x SERDES power down */
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
+ if (err)
+ return err;
+
+ /* Check link capabilities */
+ err = drm_dp_link_probe(&anx6345->aux, &anx6345->link);
+ if (err < 0) {
+ DRM_ERROR("Failed to probe link capabilities: %d\n", err);
+ return err;
+ }
+
+ /* Power up the sink */
+ err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link);
+ if (err < 0) {
+ DRM_ERROR("Failed to power up DisplayPort link: %d\n", err);
+ return err;
+ }
+
+ /* Possibly enable downspread on the sink */
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_DOWNSPREAD_CTRL1_REG, 0);
+ if (err)
+ return err;
+
+ if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
+ DRM_DEBUG("Enable downspread on the sink\n");
+ /* 4000PPM */
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_DOWNSPREAD_CTRL1_REG, 8);
+ if (err)
+ return err;
+
+ err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
+ DP_SPREAD_AMP_0_5);
+ if (err < 0)
+ return err;
+ } else {
+ err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
+ if (err < 0)
+ return err;
+ }
+
+ /* Set the lane count and the link rate on the sink */
+ if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_SYSTEM_CTRL_BASE + 4,
+ SP_ENHANCED_MODE);
+ else
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_SYSTEM_CTRL_BASE + 4,
+ SP_ENHANCED_MODE);
+ if (err)
+ return err;
+
+ value = drm_dp_link_rate_to_bw_code(anx6345->link.rate);
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_MAIN_LINK_BW_SET_REG, value);
+ if (err)
+ return err;
+
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes);
+ if (err)
+ return err;
+
+ err = drm_dp_link_configure(&anx6345->aux, &anx6345->link);
+ if (err < 0) {
+ DRM_ERROR("Failed to configure DisplayPort link: %d\n", err);
+ return err;
+ }
+
+ /* Start training on the source */
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
+ SP_LT_EN);
+ if (err)
+ return err;
+
+ err = regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_LT_CTRL_REG,
+ value, !(value & SP_DP_LT_INPROGRESS),
+ POLL_DELAY, POLL_TIMEOUT);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int anx6345_tx_initialization(struct anx6345 *anx6345)
+{
+ int err, i;
+
+ /* FIXME: hardcode color depth now */
+ err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
+ SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
+ if (err)
+ return err;
+
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
+ if (err)
+ return err;
+
+ err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
+ SP_ANALOG_DEBUG1_REG, 0);
+ if (err)
+ return err;
+
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_LINK_DEBUG_CTRL_REG,
+ SP_NEW_PRBS7 | SP_M_VID_DEBUG);
+ if (err)
+ return err;
+
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_ANALOG_POWER_DOWN_REG, 0);
+ if (err)
+ return err;
+
+ /* Force HPD */
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_SYSTEM_CTRL_BASE + 3,
+ SP_HPD_FORCE | SP_HPD_CTRL);
+ if (err)
+ return err;
+
+ for (i = 0; i < 4; i++) {
+ /* 4 lanes */
+ err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_LANE0_LT_CTRL_REG + i, 0);
+ if (err)
+ return err;
+ }
+
+ /* Reset AUX */
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
+ SP_RESET_CTRL2_REG, SP_AUX_RST);
+ if (err)
+ return err;
+
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+ SP_RESET_CTRL2_REG, SP_AUX_RST);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void anx6345_poweron(struct anx6345 *anx6345)
+{
+ int err;
+
+ /* Ensure reset is asserted before starting power on sequence */
+ gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
+ usleep_range(1000, 2000);
+
+ err = regulator_enable(anx6345->dvdd12);
+ if (err) {
+ DRM_ERROR("Failed to enable DVDD12 regulator: %d\n",
+ err);
+ return;
+ }
+
+ /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
+ usleep_range(1000, 2000);
+
+ err = regulator_enable(anx6345->dvdd25);
+ if (err) {
+ DRM_ERROR("Failed to enable DVDD25 regulator: %d\n",
+ err);
+ return;
+ }
+
+ /* T2 - delay between RESETN and all power rail stable,
+ * should be 2-5ms
+ */
+ usleep_range(2000, 5000);
+
+ gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
+
+ /* Power on registers module */
+ anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+ SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
+ anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+ SP_REGISTER_PD | SP_TOTAL_PD);
+
+ if (anx6345->panel)
+ drm_panel_prepare(anx6345->panel);
+
+ anx6345->powered = true;
+}
+
+static void anx6345_poweroff(struct anx6345 *anx6345)
+{
+ int err;
+
+ gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
+ usleep_range(1000, 2000);
+
+ if (anx6345->panel)
+ drm_panel_unprepare(anx6345->panel);
+
+ err = regulator_disable(anx6345->dvdd25);
+ if (err) {
+ DRM_ERROR("Failed to disable DVDD25 regulator: %d\n",
+ err);
+ return;
+ }
+
+ usleep_range(5000, 10000);
+
+ err = regulator_disable(anx6345->dvdd12);
+ if (err) {
+ DRM_ERROR("Failed to disable DVDD12 regulator: %d\n",
+ err);
+ return;
+ }
+
+ usleep_range(1000, 2000);
+
+ anx6345->powered = false;
+}
+
+static int anx6345_start(struct anx6345 *anx6345)
+{
+ int err;
+
+ if (!anx6345->powered)
+ anx6345_poweron(anx6345);
+
+ /* Power on needed modules */
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+ SP_POWERDOWN_CTRL_REG,
+ SP_VIDEO_PD | SP_LINK_PD);
+
+ err = anx6345_tx_initialization(anx6345);
+ if (err) {
+ DRM_ERROR("Failed DisplayPort transmitter initialization: %d\n", err);
+ anx6345_poweroff(anx6345);
+ return err;
+ }
+
+ err = anx6345_dp_link_training(anx6345);
+ if (err) {
+ DRM_ERROR("Failed link training: %d\n", err);
+ anx6345_poweroff(anx6345);
+ return err;
+ }
+
+ /*
+ * This delay seems to help keep the hardware in a good state. Without
+ * it, there are times where it fails silently.
+ */
+ usleep_range(10000, 15000);
+
+ return 0;
+}
+
+static int anx6345_config_dp_output(struct anx6345 *anx6345)
+{
+ int err;
+
+ err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+ SP_VIDEO_MUTE);
+ if (err)
+ return err;
+
+ /* Enable DP output */
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+ SP_VIDEO_EN);
+ if (err)
+ return err;
+
+ /* Force stream valid */
+ err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+ SP_DP_SYSTEM_CTRL_BASE + 3,
+ SP_STRM_FORCE | SP_STRM_CTRL);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int anx6345_get_downstream_info(struct anx6345 *anx6345)
+{
+ u8 value;
+ int err;
+
+ err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
+ if (err < 0) {
+ DRM_ERROR("Get sink count failed %d\n", err);
+ return err;
+ }
+
+ if (!DP_GET_SINK_COUNT(value)) {
+ DRM_ERROR("Downstream disconnected\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int anx6345_get_modes(struct drm_connector *connector)
+{
+ struct anx6345 *anx6345 = connector_to_anx6345(connector);
+ int err, num_modes = 0;
+ bool power_off = false;
+
+ mutex_lock(&anx6345->lock);
+
+ if (!anx6345->edid) {
+ if (!anx6345->powered) {
+ anx6345_poweron(anx6345);
+ power_off = true;
+ }
+
+ err = anx6345_get_downstream_info(anx6345);
+ if (err) {
+ DRM_ERROR("Failed to get downstream info: %d\n", err);
+ goto unlock;
+ }
+
+ anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
+ if (!anx6345->edid)
+ DRM_ERROR("Failed to read EDID from panel\n");
+
+ err = drm_connector_update_edid_property(connector,
+ anx6345->edid);
+ if (err) {
+ DRM_ERROR("Failed to update EDID property: %d\n", err);
+ goto unlock;
+ }
+ }
+
+ num_modes += drm_add_edid_modes(connector, anx6345->edid);
+
+unlock:
+ if (power_off)
+ anx6345_poweroff(anx6345);
+
+ mutex_unlock(&anx6345->lock);
+
+ if (!num_modes && anx6345->panel)
+ num_modes += drm_panel_get_modes(anx6345->panel);
+
+ return num_modes;
+}
+
+static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
+ .get_modes = anx6345_get_modes,
+};
+
+static void
+anx6345_connector_destroy(struct drm_connector *connector)
+{
+ struct anx6345 *anx6345 = connector_to_anx6345(connector);
+
+ if (anx6345->panel)
+ drm_panel_detach(anx6345->panel);
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs anx6345_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = anx6345_connector_destroy,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int anx6345_bridge_attach(struct drm_bridge *bridge)
+{
+ struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+ int err;
+
+ if (!bridge->encoder) {
+ DRM_ERROR("Parent encoder object not found");
+ return -ENODEV;
+ }
+
+ /* Register aux channel */
+ anx6345->aux.name = "DP-AUX";
+ anx6345->aux.dev = &anx6345->client->dev;
+ anx6345->aux.transfer = anx6345_aux_transfer;
+
+ err = drm_dp_aux_register(&anx6345->aux);
+ if (err < 0) {
+ DRM_ERROR("Failed to register aux channel: %d\n", err);
+ return err;
+ }
+
+ err = drm_connector_init(bridge->dev, &anx6345->connector,
+ &anx6345_connector_funcs,
+ DRM_MODE_CONNECTOR_eDP);
+ if (err) {
+ DRM_ERROR("Failed to initialize connector: %d\n", err);
+ return err;
+ }
+
+ drm_connector_helper_add(&anx6345->connector,
+ &anx6345_connector_helper_funcs);
+
+ err = drm_connector_register(&anx6345->connector);
+ if (err) {
+ DRM_ERROR("Failed to register connector: %d\n", err);
+ return err;
+ }
+
+ anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
+ err = drm_connector_attach_encoder(&anx6345->connector,
+ bridge->encoder);
+ if (err) {
+ DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
+ return err;
+ }
+
+ if (anx6345->panel) {
+ err = drm_panel_attach(anx6345->panel, &anx6345->connector);
+ if (err) {
+ DRM_ERROR("Failed to attach panel: %d\n", err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static enum drm_mode_status
+anx6345_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ return MODE_NO_INTERLACE;
+
+ /* Max 1200p at 5.4 Ghz, one lane */
+ if (mode->clock > 154000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static void anx6345_bridge_disable(struct drm_bridge *bridge)
+{
+ struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+
+ /* Power off all modules except configuration registers access */
+ anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+ SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
+ if (anx6345->panel)
+ drm_panel_disable(anx6345->panel);
+
+ if (anx6345->powered)
+ anx6345_poweroff(anx6345);
+}
+
+static void anx6345_bridge_enable(struct drm_bridge *bridge)
+{
+ struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+ int err;
+
+ if (anx6345->panel)
+ drm_panel_enable(anx6345->panel);
+
+ err = anx6345_start(anx6345);
+ if (err) {
+ DRM_ERROR("Failed to initialize: %d\n", err);
+ return;
+ }
+
+ err = anx6345_config_dp_output(anx6345);
+ if (err)
+ DRM_ERROR("Failed to enable DP output: %d\n", err);
+}
+
+static const struct drm_bridge_funcs anx6345_bridge_funcs = {
+ .attach = anx6345_bridge_attach,
+ .mode_valid = anx6345_bridge_mode_valid,
+ .disable = anx6345_bridge_disable,
+ .enable = anx6345_bridge_enable,
+};
+
+static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
+{
+ unsigned int i;
+
+ for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
+ if (anx6345->i2c_clients[i] &&
+ anx6345->i2c_clients[i]->addr != anx6345->client->addr)
+ i2c_unregister_device(anx6345->i2c_clients[i]);
+}
+
+static const struct regmap_config anx6345_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xff,
+ .cache_type = REGCACHE_NONE,
+};
+
+static const u16 anx6345_chipid_list[] = {
+ 0x6345,
+};
+
+static int anx6345_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct anx6345 *anx6345;
+ struct device *dev;
+ unsigned int i, idl, idh, version;
+ bool found = false;
+ int err;
+
+ anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
+ if (!anx6345)
+ return -ENOMEM;
+
+ mutex_init(&anx6345->lock);
+
+ anx6345->bridge.of_node = client->dev.of_node;
+
+ anx6345->client = client;
+ i2c_set_clientdata(client, anx6345);
+
+ dev = &anx6345->client->dev;
+
+ err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
+ &anx6345->panel, NULL);
+ if (err == -EPROBE_DEFER)
+ return err;
+
+ if (err)
+ DRM_DEBUG("No panel found\n");
+
+ /* 1.2V digital core power regulator */
+ anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply");
+ if (IS_ERR(anx6345->dvdd12)) {
+ DRM_ERROR("DVDD12 regulator not found\n");
+ return PTR_ERR(anx6345->dvdd12);
+ }
+
+ /* 2.5V digital core power regulator */
+ anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply");
+ if (IS_ERR(anx6345->dvdd25)) {
+ DRM_ERROR("DVDD25 regulator not found\n");
+ return PTR_ERR(anx6345->dvdd25);
+ }
+
+ /* GPIO for chip reset */
+ anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(anx6345->gpiod_reset)) {
+ DRM_ERROR("Reset gpio not found\n");
+ return PTR_ERR(anx6345->gpiod_reset);
+ }
+
+ /* Map slave addresses of ANX6345 */
+ for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
+ if (anx6345_i2c_addresses[i] >> 1 != client->addr)
+ anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter,
+ anx6345_i2c_addresses[i] >> 1);
+ else
+ anx6345->i2c_clients[i] = client;
+
+ if (!anx6345->i2c_clients[i]) {
+ err = -ENOMEM;
+ DRM_ERROR("Failed to reserve I2C bus %02x\n",
+ anx6345_i2c_addresses[i]);
+ goto err_unregister_i2c;
+ }
+
+ anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
+ &anx6345_regmap_config);
+ if (IS_ERR(anx6345->map[i])) {
+ err = PTR_ERR(anx6345->map[i]);
+ DRM_ERROR("Failed regmap initialization %02x\n",
+ anx6345_i2c_addresses[i]);
+ goto err_unregister_i2c;
+ }
+ }
+
+ /* Look for supported chip ID */
+ anx6345_poweron(anx6345);
+
+ err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG,
+ &idl);
+ if (err)
+ goto err_poweroff;
+
+ err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG,
+ &idh);
+ if (err)
+ goto err_poweroff;
+
+ anx6345->chipid = (u8)idl | ((u8)idh << 8);
+
+ err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
+ &version);
+ if (err)
+ goto err_poweroff;
+
+ for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
+ if (anx6345->chipid == anx6345_chipid_list[i]) {
+ DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
+ anx6345->chipid, version);
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
+ anx6345->chipid, version);
+ err = -ENODEV;
+ goto err_poweroff;
+ }
+
+ anx6345->bridge.funcs = &anx6345_bridge_funcs;
+
+ drm_bridge_add(&anx6345->bridge);
+
+ anx6345_poweroff(anx6345);
+
+ return 0;
+
+err_poweroff:
+ anx6345_poweroff(anx6345);
+
+err_unregister_i2c:
+ unregister_i2c_dummy_clients(anx6345);
+ return err;
+}
+
+static int anx6345_i2c_remove(struct i2c_client *client)
+{
+ struct anx6345 *anx6345 = i2c_get_clientdata(client);
+
+ drm_bridge_remove(&anx6345->bridge);
+
+ unregister_i2c_dummy_clients(anx6345);
+
+ kfree(anx6345->edid);
+
+ return 0;
+}
+
+static const struct i2c_device_id anx6345_id[] = {
+ { "anx6345", 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, anx6345_id);
+
+static const struct of_device_id anx6345_match_table[] = {
+ { .compatible = "analogix,anx6345", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, anx6345_match_table);
+
+static struct i2c_driver anx6345_driver = {
+ .driver = {
+ .name = "anx6345",
+ .of_match_table = of_match_ptr(anx6345_match_table),
+ },
+ .probe = anx6345_i2c_probe,
+ .remove = anx6345_i2c_remove,
+ .id_table = anx6345_id,
+};
+module_i2c_driver(anx6345_driver);
+
+MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
+MODULE_AUTHOR("Icenowy Zheng <[email protected]>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
index 9cb30962032e..53b0e73d6a24 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
@@ -117,7 +117,7 @@ ssize_t anx_aux_transfer(struct regmap *map_dptx, struct drm_dp_aux_msg *msg)
else /* For non-zero-sized set the length field. */
ctrl1 |= (msg->size - 1) << SP_AUX_LENGTH_SHIFT;
- if ((msg->request & DP_AUX_I2C_READ) == 0) {
+ if ((msg->size > 0) && ((msg->request & DP_AUX_I2C_READ) == 0)) {
/* When WRITE | MOT write values to data buffer */
err = regmap_bulk_write(map_dptx,
SP_DP_BUF_DATA0_REG, buffer,
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
index c2ca854613a0..b29a0b3bc23c 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
@@ -75,7 +75,11 @@
#define SP_CHA_STA BIT(2)
/* Bits for DP System Control Register 3 */
#define SP_HPD_STATUS BIT(6)
+#define SP_HPD_FORCE BIT(5)
+#define SP_HPD_CTRL BIT(4)
#define SP_STRM_VALID BIT(2)
+#define SP_STRM_FORCE BIT(1)
+#define SP_STRM_CTRL BIT(0)
/* Bits for DP System Control Register 4 */
#define SP_ENHANCED_MODE BIT(3)
@@ -120,6 +124,9 @@
#define SP_LINK_BW_SET_MASK 0x1f
#define SP_INITIAL_SLIM_M_AUD_SEL BIT(5)
+/* DP Lane Count Setting Register */
+#define SP_DP_LANE_COUNT_SET_REG 0xa1
+
/* DP Training Pattern Set Register */
#define SP_DP_TRAINING_PATTERN_SET_REG 0xa2
@@ -133,6 +140,7 @@
/* DP Link Training Control Register */
#define SP_DP_LT_CTRL_REG 0xa8
+#define SP_DP_LT_INPROGRESS 0x80
#define SP_LT_ERROR_TYPE_MASK 0x70
# define SP_LT_NO_ERROR 0x00
# define SP_LT_AUX_WRITE_ERROR 0x01
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
index 7d683573e970..480c98a225b1 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
@@ -183,6 +183,9 @@
#define SP_VBIT BIT(1)
#define SP_AUDIO_LAYOUT BIT(0)
+/* Analog Debug Register 1 */
+#define SP_ANALOG_DEBUG1_REG 0xdc
+
/* Analog Debug Register 2 */
#define SP_ANALOG_DEBUG2_REG 0xdd
#define SP_FORCE_SW_OFF_BYPASS 0x20
--
2.16.4
Hi Torsten,
Thank you for the patch.
On Thu, May 23, 2019 at 08:53:56AM +0200, Torsten Duwe wrote:
> From: Icenowy Zheng <[email protected]>
>
> The ANX6345 is an ultra-low power DisplayPower/eDP transmitter designed
> for portable devices. This driver adds initial support for RGB to eDP
> mode, without HPD and interrupts.
>
> This is a configuration usually seen in eDP applications.
>
> Signed-off-by: Icenowy Zheng <[email protected]>
> Signed-off-by: Vasily Khoruzhick <[email protected]>
> Signed-off-by: Torsten Duwe <[email protected]>
> ---
> drivers/gpu/drm/bridge/analogix/Kconfig | 11 +
> drivers/gpu/drm/bridge/analogix/Makefile | 1 +
> drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 808 +++++++++++++++++++++
> .../gpu/drm/bridge/analogix/analogix-i2c-dptx.c | 2 +-
> .../gpu/drm/bridge/analogix/analogix-i2c-dptx.h | 8 +
> .../drm/bridge/analogix/analogix-i2c-txcommon.h | 3 +
> 6 files changed, 832 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
>
> diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig b/drivers/gpu/drm/bridge/analogix/Kconfig
> index ed2d05c12546..3c6ec535d361 100644
> --- a/drivers/gpu/drm/bridge/analogix/Kconfig
> +++ b/drivers/gpu/drm/bridge/analogix/Kconfig
> @@ -1,3 +1,14 @@
> # SPDX-License-Identifier: GPL-2.0-only
> +config DRM_ANALOGIX_ANX6345
> + tristate "Analogix ANX6345 bridge"
> + select DRM_ANALOGIX_DP_I2C
> + select DRM_KMS_HELPER
> + select REGMAP_I2C
> + help
> + ANX6345 is an ultra-low Full-HD DisplayPort/eDP
> + transmitter designed for portable devices. The
> + ANX6345 transforms the LVTTL RGB output of an
> + application processor to eDP or DisplayPort.
> +
> config DRM_ANALOGIX_ANX78XX
> tristate "Analogix ANX78XX bridge"
> select DRM_ANALOGIX_DP_I2C
> diff --git a/drivers/gpu/drm/bridge/analogix/Makefile b/drivers/gpu/drm/bridge/analogix/Makefile
> index 2d523b67487d..12fed7b04e1e 100644
> --- a/drivers/gpu/drm/bridge/analogix/Makefile
> +++ b/drivers/gpu/drm/bridge/analogix/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o
> analogix_dp_i2c-objs := analogix-i2c-dptx.o
> +obj-$(CONFIG_DRM_ANALOGIX_ANX6345) += analogix-anx6345.o
> obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
> obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o
> obj-$(CONFIG_DRM_ANALOGIX_DP_I2C) += analogix_dp_i2c.o
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> new file mode 100644
> index 000000000000..36f38a9f042a
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> @@ -0,0 +1,810 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright(c) Icenowy Zheng <[email protected]>
> + * Based on analogix-anx6345.c, which is:
> + * Copyright(c) 2016, Analogix Semiconductor.
> + */
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/regmap.h>
> +#include <linux/types.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_panel.h>
Could you please sort the includes alphabetically to make it easer to
locate duplicates ?
> +
> +#include "analogix-i2c-dptx.h"
> +#include "analogix-i2c-txcommon.h"
> +
> +#define I2C_NUM_ADDRESSES 2
> +#define I2C_IDX_DPTX 0
> +#define I2C_IDX_TXCOM 1
> +
> +#define POLL_DELAY 50000 /* us */
> +#define POLL_TIMEOUT 5000000 /* us */
> +
> +static const u8 anx6345_i2c_addresses[] = {
> + [I2C_IDX_DPTX] = ANALOGIX_I2C_DPTX,
> + [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON,
> +};
> +
> +struct anx6345 {
> + struct drm_dp_aux aux;
> + struct drm_bridge bridge;
> + struct i2c_client *client;
> + struct edid *edid;
> + struct drm_connector connector;
> + struct drm_dp_link link;
> + struct drm_panel *panel;
> + struct regulator *dvdd12;
> + struct regulator *dvdd25;
> + struct gpio_desc *gpiod_reset;
> + struct mutex lock;
Please add a comment to explain what the lock protects.
> +
> + /*
> + * I2C Slave addresses of ANX6345 are mapped as DPTX and SYS
> + */
This can hold on a single line comment.
> + struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
> + struct regmap *map[I2C_NUM_ADDRESSES];
> +
> + u16 chipid;
> + u8 dpcd[DP_RECEIVER_CAP_SIZE];
> +
> + bool powered;
> +};
> +
> +static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
> +{
> + return container_of(c, struct anx6345, connector);
> +}
> +
> +static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct anx6345, bridge);
> +}
> +
> +static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
> +{
> + return regmap_update_bits(map, reg, mask, mask);
> +}
> +
> +static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
> +{
> + return regmap_update_bits(map, reg, mask, 0);
> +}
> +
> +static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
> + struct drm_dp_aux_msg *msg)
> +{
> + struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
> +
> + return anx_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
> +}
> +
> +static int anx6345_dp_link_training(struct anx6345 *anx6345)
> +{
> + unsigned int value;
> + u8 dp_bw;
> + int err;
> +
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_POWERDOWN_CTRL_REG,
> + SP_TOTAL_PD);
> + if (err)
> + return err;
> +
> + err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
> + if (err < 0)
> + return err;
> +
> + switch (dp_bw) {
> + case DP_LINK_BW_1_62:
> + case DP_LINK_BW_2_7:
> + break;
> +
> + default:
> + DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
> + return -EINVAL;
> + }
> +
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
> + SP_VIDEO_MUTE);
> + if (err)
> + return err;
> +
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_VID_CTRL1_REG, SP_VIDEO_EN);
> + if (err)
> + return err;
> +
> + /* Get DPCD info */
> + err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
> + &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
> + if (err < 0) {
> + DRM_ERROR("Failed to read DPCD: %d\n", err);
> + return err;
> + }
> +
> + /* Clear channel x SERDES power down */
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
> + if (err)
> + return err;
> +
> + /* Check link capabilities */
> + err = drm_dp_link_probe(&anx6345->aux, &anx6345->link);
> + if (err < 0) {
> + DRM_ERROR("Failed to probe link capabilities: %d\n", err);
> + return err;
> + }
> +
> + /* Power up the sink */
> + err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link);
> + if (err < 0) {
> + DRM_ERROR("Failed to power up DisplayPort link: %d\n", err);
> + return err;
> + }
> +
> + /* Possibly enable downspread on the sink */
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_DOWNSPREAD_CTRL1_REG, 0);
> + if (err)
> + return err;
> +
> + if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
> + DRM_DEBUG("Enable downspread on the sink\n");
> + /* 4000PPM */
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_DOWNSPREAD_CTRL1_REG, 8);
> + if (err)
> + return err;
> +
> + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
> + DP_SPREAD_AMP_0_5);
> + if (err < 0)
> + return err;
> + } else {
> + err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
> + if (err < 0)
> + return err;
> + }
> +
> + /* Set the lane count and the link rate on the sink */
> + if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_SYSTEM_CTRL_BASE + 4,
> + SP_ENHANCED_MODE);
> + else
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_SYSTEM_CTRL_BASE + 4,
> + SP_ENHANCED_MODE);
> + if (err)
> + return err;
> +
> + value = drm_dp_link_rate_to_bw_code(anx6345->link.rate);
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_MAIN_LINK_BW_SET_REG, value);
> + if (err)
> + return err;
> +
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes);
> + if (err)
> + return err;
> +
> + err = drm_dp_link_configure(&anx6345->aux, &anx6345->link);
> + if (err < 0) {
> + DRM_ERROR("Failed to configure DisplayPort link: %d\n", err);
> + return err;
> + }
> +
> + /* Start training on the source */
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
> + SP_LT_EN);
> + if (err)
> + return err;
> +
> + err = regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_LT_CTRL_REG,
> + value, !(value & SP_DP_LT_INPROGRESS),
> + POLL_DELAY, POLL_TIMEOUT);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static int anx6345_tx_initialization(struct anx6345 *anx6345)
> +{
> + int err, i;
> +
> + /* FIXME: hardcode color depth now */
> + err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
> + SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
> + if (err)
> + return err;
> +
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
> + if (err)
> + return err;
> +
> + err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
> + SP_ANALOG_DEBUG1_REG, 0);
> + if (err)
> + return err;
> +
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_LINK_DEBUG_CTRL_REG,
> + SP_NEW_PRBS7 | SP_M_VID_DEBUG);
> + if (err)
> + return err;
> +
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_ANALOG_POWER_DOWN_REG, 0);
> + if (err)
> + return err;
> +
> + /* Force HPD */
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_SYSTEM_CTRL_BASE + 3,
> + SP_HPD_FORCE | SP_HPD_CTRL);
> + if (err)
> + return err;
> +
> + for (i = 0; i < 4; i++) {
> + /* 4 lanes */
> + err = regmap_write(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_LANE0_LT_CTRL_REG + i, 0);
> + if (err)
> + return err;
> + }
> +
> + /* Reset AUX */
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_RESET_CTRL2_REG, SP_AUX_RST);
> + if (err)
> + return err;
> +
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_RESET_CTRL2_REG, SP_AUX_RST);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static void anx6345_poweron(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + /* Ensure reset is asserted before starting power on sequence */
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
> + usleep_range(1000, 2000);
> +
> + err = regulator_enable(anx6345->dvdd12);
> + if (err) {
> + DRM_ERROR("Failed to enable DVDD12 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
> + usleep_range(1000, 2000);
> +
> + err = regulator_enable(anx6345->dvdd25);
> + if (err) {
> + DRM_ERROR("Failed to enable DVDD25 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + /* T2 - delay between RESETN and all power rail stable,
> + * should be 2-5ms
> + */
> + usleep_range(2000, 5000);
> +
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
> +
> + /* Power on registers module */
> + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
> + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
> + anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
> + SP_REGISTER_PD | SP_TOTAL_PD);
> +
> + if (anx6345->panel)
> + drm_panel_prepare(anx6345->panel);
> +
> + anx6345->powered = true;
> +}
> +
> +static void anx6345_poweroff(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
> + usleep_range(1000, 2000);
> +
> + if (anx6345->panel)
> + drm_panel_unprepare(anx6345->panel);
> +
> + err = regulator_disable(anx6345->dvdd25);
> + if (err) {
> + DRM_ERROR("Failed to disable DVDD25 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + usleep_range(5000, 10000);
> +
> + err = regulator_disable(anx6345->dvdd12);
> + if (err) {
> + DRM_ERROR("Failed to disable DVDD12 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + usleep_range(1000, 2000);
> +
> + anx6345->powered = false;
> +}
> +
> +static int anx6345_start(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + if (!anx6345->powered)
> + anx6345_poweron(anx6345);
> +
> + /* Power on needed modules */
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_POWERDOWN_CTRL_REG,
> + SP_VIDEO_PD | SP_LINK_PD);
> +
> + err = anx6345_tx_initialization(anx6345);
> + if (err) {
> + DRM_ERROR("Failed DisplayPort transmitter initialization: %d\n", err);
> + anx6345_poweroff(anx6345);
> + return err;
> + }
> +
> + err = anx6345_dp_link_training(anx6345);
> + if (err) {
> + DRM_ERROR("Failed link training: %d\n", err);
> + anx6345_poweroff(anx6345);
> + return err;
> + }
> +
> + /*
> + * This delay seems to help keep the hardware in a good state. Without
> + * it, there are times where it fails silently.
> + */
> + usleep_range(10000, 15000);
> +
> + return 0;
> +}
> +
> +static int anx6345_config_dp_output(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
> + SP_VIDEO_MUTE);
> + if (err)
> + return err;
> +
> + /* Enable DP output */
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
> + SP_VIDEO_EN);
> + if (err)
> + return err;
> +
> + /* Force stream valid */
> + err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_SYSTEM_CTRL_BASE + 3,
> + SP_STRM_FORCE | SP_STRM_CTRL);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static int anx6345_get_downstream_info(struct anx6345 *anx6345)
> +{
> + u8 value;
> + int err;
> +
> + err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
> + if (err < 0) {
> + DRM_ERROR("Get sink count failed %d\n", err);
> + return err;
> + }
> +
> + if (!DP_GET_SINK_COUNT(value)) {
> + DRM_ERROR("Downstream disconnected\n");
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> +static int anx6345_get_modes(struct drm_connector *connector)
> +{
> + struct anx6345 *anx6345 = connector_to_anx6345(connector);
> + int err, num_modes = 0;
> + bool power_off = false;
> +
> + mutex_lock(&anx6345->lock);
> +
> + if (!anx6345->edid) {
Could the chip be used with a hot-pluggable display, or is it guaranteed
that EDID will never change ?
> + if (!anx6345->powered) {
> + anx6345_poweron(anx6345);
> + power_off = true;
> + }
> +
> + err = anx6345_get_downstream_info(anx6345);
> + if (err) {
> + DRM_ERROR("Failed to get downstream info: %d\n", err);
> + goto unlock;
> + }
> +
> + anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
> + if (!anx6345->edid)
> + DRM_ERROR("Failed to read EDID from panel\n");
> +
> + err = drm_connector_update_edid_property(connector,
> + anx6345->edid);
> + if (err) {
> + DRM_ERROR("Failed to update EDID property: %d\n", err);
> + goto unlock;
> + }
> + }
> +
> + num_modes += drm_add_edid_modes(connector, anx6345->edid);
> +
> +unlock:
> + if (power_off)
> + anx6345_poweroff(anx6345);
> +
> + mutex_unlock(&anx6345->lock);
> +
> + if (!num_modes && anx6345->panel)
> + num_modes += drm_panel_get_modes(anx6345->panel);
> +
> + return num_modes;
> +}
> +
> +static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
> + .get_modes = anx6345_get_modes,
> +};
> +
> +static void
> +anx6345_connector_destroy(struct drm_connector *connector)
> +{
> + struct anx6345 *anx6345 = connector_to_anx6345(connector);
> +
> + if (anx6345->panel)
> + drm_panel_detach(anx6345->panel);
> + drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs anx6345_connector_funcs = {
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = anx6345_connector_destroy,
> + .reset = drm_atomic_helper_connector_reset,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int anx6345_bridge_attach(struct drm_bridge *bridge)
> +{
> + struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
> + int err;
> +
> + if (!bridge->encoder) {
> + DRM_ERROR("Parent encoder object not found");
> + return -ENODEV;
> + }
> +
> + /* Register aux channel */
> + anx6345->aux.name = "DP-AUX";
> + anx6345->aux.dev = &anx6345->client->dev;
> + anx6345->aux.transfer = anx6345_aux_transfer;
> +
> + err = drm_dp_aux_register(&anx6345->aux);
> + if (err < 0) {
> + DRM_ERROR("Failed to register aux channel: %d\n", err);
> + return err;
> + }
> +
> + err = drm_connector_init(bridge->dev, &anx6345->connector,
> + &anx6345_connector_funcs,
> + DRM_MODE_CONNECTOR_eDP);
> + if (err) {
> + DRM_ERROR("Failed to initialize connector: %d\n", err);
> + return err;
> + }
> +
> + drm_connector_helper_add(&anx6345->connector,
> + &anx6345_connector_helper_funcs);
> +
> + err = drm_connector_register(&anx6345->connector);
> + if (err) {
> + DRM_ERROR("Failed to register connector: %d\n", err);
> + return err;
> + }
> +
> + anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
> +
> + err = drm_connector_attach_encoder(&anx6345->connector,
> + bridge->encoder);
> + if (err) {
> + DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
> + return err;
> + }
> +
> + if (anx6345->panel) {
> + err = drm_panel_attach(anx6345->panel, &anx6345->connector);
> + if (err) {
> + DRM_ERROR("Failed to attach panel: %d\n", err);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static enum drm_mode_status
> +anx6345_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> + return MODE_NO_INTERLACE;
> +
> + /* Max 1200p at 5.4 Ghz, one lane */
> + if (mode->clock > 154000)
> + return MODE_CLOCK_HIGH;
> +
> + return MODE_OK;
> +}
> +
> +static void anx6345_bridge_disable(struct drm_bridge *bridge)
> +{
> + struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
> +
> + /* Power off all modules except configuration registers access */
> + anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
> + SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
> + if (anx6345->panel)
> + drm_panel_disable(anx6345->panel);
How about using the drm_panel_bridge infrastructure ? It would be easier
than handling the panel manually, as the bridge core will do it for you.
> +
> + if (anx6345->powered)
> + anx6345_poweroff(anx6345);
> +}
> +
> +static void anx6345_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
> + int err;
> +
> + if (anx6345->panel)
> + drm_panel_enable(anx6345->panel);
> +
> + err = anx6345_start(anx6345);
> + if (err) {
> + DRM_ERROR("Failed to initialize: %d\n", err);
> + return;
> + }
> +
> + err = anx6345_config_dp_output(anx6345);
> + if (err)
> + DRM_ERROR("Failed to enable DP output: %d\n", err);
> +}
> +
> +static const struct drm_bridge_funcs anx6345_bridge_funcs = {
> + .attach = anx6345_bridge_attach,
> + .mode_valid = anx6345_bridge_mode_valid,
> + .disable = anx6345_bridge_disable,
> + .enable = anx6345_bridge_enable,
> +};
> +
> +static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
> +{
> + unsigned int i;
> +
> + for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
> + if (anx6345->i2c_clients[i] &&
> + anx6345->i2c_clients[i]->addr != anx6345->client->addr)
> + i2c_unregister_device(anx6345->i2c_clients[i]);
> +}
> +
> +static const struct regmap_config anx6345_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0xff,
> + .cache_type = REGCACHE_NONE,
> +};
> +
> +static const u16 anx6345_chipid_list[] = {
> + 0x6345,
> +};
> +
> +static int anx6345_i2c_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct anx6345 *anx6345;
> + struct device *dev;
> + unsigned int i, idl, idh, version;
> + bool found = false;
> + int err;
> +
> + anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
> + if (!anx6345)
> + return -ENOMEM;
> +
> + mutex_init(&anx6345->lock);
> +
> + anx6345->bridge.of_node = client->dev.of_node;
> +
> + anx6345->client = client;
> + i2c_set_clientdata(client, anx6345);
> +
> + dev = &anx6345->client->dev;
> +
> + err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
> + &anx6345->panel, NULL);
> + if (err == -EPROBE_DEFER)
> + return err;
> +
> + if (err)
> + DRM_DEBUG("No panel found\n");
Shouldn't this be fatal ?
> +
> + /* 1.2V digital core power regulator */
> + anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply");
> + if (IS_ERR(anx6345->dvdd12)) {
> + DRM_ERROR("DVDD12 regulator not found\n");
> + return PTR_ERR(anx6345->dvdd12);
> + }
> +
> + /* 2.5V digital core power regulator */
> + anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply");
> + if (IS_ERR(anx6345->dvdd25)) {
> + DRM_ERROR("DVDD25 regulator not found\n");
> + return PTR_ERR(anx6345->dvdd25);
> + }
> +
> + /* GPIO for chip reset */
> + anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(anx6345->gpiod_reset)) {
> + DRM_ERROR("Reset gpio not found\n");
> + return PTR_ERR(anx6345->gpiod_reset);
> + }
> +
> + /* Map slave addresses of ANX6345 */
> + for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
> + if (anx6345_i2c_addresses[i] >> 1 != client->addr)
> + anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter,
> + anx6345_i2c_addresses[i] >> 1);
> + else
> + anx6345->i2c_clients[i] = client;
> +
> + if (!anx6345->i2c_clients[i]) {
> + err = -ENOMEM;
> + DRM_ERROR("Failed to reserve I2C bus %02x\n",
> + anx6345_i2c_addresses[i]);
> + goto err_unregister_i2c;
> + }
> +
> + anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
> + &anx6345_regmap_config);
> + if (IS_ERR(anx6345->map[i])) {
> + err = PTR_ERR(anx6345->map[i]);
> + DRM_ERROR("Failed regmap initialization %02x\n",
> + anx6345_i2c_addresses[i]);
> + goto err_unregister_i2c;
> + }
> + }
> +
> + /* Look for supported chip ID */
> + anx6345_poweron(anx6345);
> +
> + err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG,
> + &idl);
> + if (err)
> + goto err_poweroff;
> +
> + err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG,
> + &idh);
> + if (err)
> + goto err_poweroff;
> +
> + anx6345->chipid = (u8)idl | ((u8)idh << 8);
> +
> + err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
> + &version);
> + if (err)
> + goto err_poweroff;
> +
> + for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
> + if (anx6345->chipid == anx6345_chipid_list[i]) {
> + DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
> + anx6345->chipid, version);
> + found = true;
> + break;
> + }
> + }
> +
> + if (!found) {
> + DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
> + anx6345->chipid, version);
> + err = -ENODEV;
> + goto err_poweroff;
> + }
If you moved the chip detection code to a separate function, you could
write this
anx6345_poweron(anx6345);
ret = anx6345_detect(anx6345);
anx6345_poweroff(anx6345);
if (ret < 0) {
...
}
and remove the power off error label. Up to you.
> +
> + anx6345->bridge.funcs = &anx6345_bridge_funcs;
> +
> + drm_bridge_add(&anx6345->bridge);
> +
> + anx6345_poweroff(anx6345);
> +
> + return 0;
> +
> +err_poweroff:
> + anx6345_poweroff(anx6345);
> +
> +err_unregister_i2c:
> + unregister_i2c_dummy_clients(anx6345);
> + return err;
> +}
> +
> +static int anx6345_i2c_remove(struct i2c_client *client)
> +{
> + struct anx6345 *anx6345 = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&anx6345->bridge);
> +
> + unregister_i2c_dummy_clients(anx6345);
> +
> + kfree(anx6345->edid);
mutex_cleanup(&anx6345->lock);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id anx6345_id[] = {
> + { "anx6345", 0 },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(i2c, anx6345_id);
> +
> +static const struct of_device_id anx6345_match_table[] = {
> + { .compatible = "analogix,anx6345", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, anx6345_match_table);
> +
> +static struct i2c_driver anx6345_driver = {
> + .driver = {
> + .name = "anx6345",
> + .of_match_table = of_match_ptr(anx6345_match_table),
> + },
> + .probe = anx6345_i2c_probe,
> + .remove = anx6345_i2c_remove,
> + .id_table = anx6345_id,
> +};
> +module_i2c_driver(anx6345_driver);
> +
> +MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
> +MODULE_AUTHOR("Icenowy Zheng <[email protected]>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
> index 9cb30962032e..53b0e73d6a24 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
> @@ -117,7 +117,7 @@ ssize_t anx_aux_transfer(struct regmap *map_dptx, struct drm_dp_aux_msg *msg)
> else /* For non-zero-sized set the length field. */
> ctrl1 |= (msg->size - 1) << SP_AUX_LENGTH_SHIFT;
>
> - if ((msg->request & DP_AUX_I2C_READ) == 0) {
> + if ((msg->size > 0) && ((msg->request & DP_AUX_I2C_READ) == 0)) {
> /* When WRITE | MOT write values to data buffer */
> err = regmap_bulk_write(map_dptx,
> SP_DP_BUF_DATA0_REG, buffer,
This and the changes below should be split to a separate patch.
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
> index c2ca854613a0..b29a0b3bc23c 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
> @@ -75,7 +75,11 @@
> #define SP_CHA_STA BIT(2)
> /* Bits for DP System Control Register 3 */
> #define SP_HPD_STATUS BIT(6)
> +#define SP_HPD_FORCE BIT(5)
> +#define SP_HPD_CTRL BIT(4)
> #define SP_STRM_VALID BIT(2)
> +#define SP_STRM_FORCE BIT(1)
> +#define SP_STRM_CTRL BIT(0)
> /* Bits for DP System Control Register 4 */
> #define SP_ENHANCED_MODE BIT(3)
>
> @@ -120,6 +124,9 @@
> #define SP_LINK_BW_SET_MASK 0x1f
> #define SP_INITIAL_SLIM_M_AUD_SEL BIT(5)
>
> +/* DP Lane Count Setting Register */
> +#define SP_DP_LANE_COUNT_SET_REG 0xa1
> +
> /* DP Training Pattern Set Register */
> #define SP_DP_TRAINING_PATTERN_SET_REG 0xa2
>
> @@ -133,6 +140,7 @@
>
> /* DP Link Training Control Register */
> #define SP_DP_LT_CTRL_REG 0xa8
> +#define SP_DP_LT_INPROGRESS 0x80
> #define SP_LT_ERROR_TYPE_MASK 0x70
> # define SP_LT_NO_ERROR 0x00
> # define SP_LT_AUX_WRITE_ERROR 0x01
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
> index 7d683573e970..480c98a225b1 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
> @@ -183,6 +183,9 @@
> #define SP_VBIT BIT(1)
> #define SP_AUDIO_LAYOUT BIT(0)
>
> +/* Analog Debug Register 1 */
> +#define SP_ANALOG_DEBUG1_REG 0xdc
> +
> /* Analog Debug Register 2 */
> #define SP_ANALOG_DEBUG2_REG 0xdd
> #define SP_FORCE_SW_OFF_BYPASS 0x20
--
Regards,
Laurent Pinchart
On Thu, May 23, 2019 at 10:50:41AM +0300, Laurent Pinchart wrote:
> Hi Torsten,
>
> Thank you for the patch.
Thank you for the thorough review!
> On Thu, May 23, 2019 at 08:53:56AM +0200, Torsten Duwe wrote:
> > +{
> > + struct anx6345 *anx6345 = connector_to_anx6345(connector);
> > + int err, num_modes = 0;
> > + bool power_off = false;
> > +
> > + mutex_lock(&anx6345->lock);
> > +
> > + if (!anx6345->edid) {
>
> Could the chip be used with a hot-pluggable display, or is it guaranteed
> that EDID will never change ?
The chip itself is capable of (e)DP hot-plugging, so the signals suggest.
See the previous discussions about what to expect on the output side.
Currently, the driver does not handle hot-plugging.
> > +
> > + err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
> > + &anx6345->panel, NULL);
> > + if (err == -EPROBE_DEFER)
> > + return err;
> > +
> > + if (err)
> > + DRM_DEBUG("No panel found\n");
>
> Shouldn't this be fatal ?
No, basically same as above. On the output side, there can be a panel,
another bridge, or some eDP plug. If the DT didn't explicitly specify
a panel or a bridge, we can still generate video output as soon as
there is valid EDID data.
Your other points went straight onto my TODO list.
Torsten